2 * OMAP4 PRM instance functions
4 * Copyright (C) 2009 Nokia Corporation
5 * Copyright (C) 2011 Texas Instruments, Inc.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/kernel.h>
14 #include <linux/types.h>
15 #include <linux/errno.h>
16 #include <linux/err.h>
21 #include "prcm-common.h"
25 #include "prminst44xx.h"
26 #include "prm-regbits-44xx.h"
28 #include "prcm_mpu44xx.h"
31 static void __iomem *_prm_bases[OMAP4_MAX_PRCM_PARTITIONS];
34 * omap_prm_base_init - Populates the prm partitions
36 * Populates the base addresses of the _prm_bases
37 * array used for read/write of prm module registers.
39 void omap_prm_base_init(void)
41 _prm_bases[OMAP4430_PRM_PARTITION] = prm_base;
42 _prm_bases[OMAP4430_PRCM_MPU_PARTITION] = prcm_mpu_base;
45 /* Read a register in a PRM instance */
46 u32 omap4_prminst_read_inst_reg(u8 part, s16 inst, u16 idx)
48 BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
49 part == OMAP4430_INVALID_PRCM_PARTITION ||
51 return __raw_readl(_prm_bases[part] + inst + idx);
54 /* Write into a register in a PRM instance */
55 void omap4_prminst_write_inst_reg(u32 val, u8 part, s16 inst, u16 idx)
57 BUG_ON(part >= OMAP4_MAX_PRCM_PARTITIONS ||
58 part == OMAP4430_INVALID_PRCM_PARTITION ||
60 __raw_writel(val, _prm_bases[part] + inst + idx);
63 /* Read-modify-write a register in PRM. Caller must lock */
64 u32 omap4_prminst_rmw_inst_reg_bits(u32 mask, u32 bits, u8 part, s16 inst,
69 v = omap4_prminst_read_inst_reg(part, inst, idx);
72 omap4_prminst_write_inst_reg(v, part, inst, idx);
78 * Address offset (in bytes) between the reset control and the reset
79 * status registers: 4 bytes on OMAP4
81 #define OMAP4_RST_CTRL_ST_OFFSET 4
84 * omap4_prminst_is_hardreset_asserted - read the HW reset line state of
85 * submodules contained in the hwmod module
86 * @rstctrl_reg: RM_RSTCTRL register address for this module
87 * @shift: register bit shift corresponding to the reset line to check
89 * Returns 1 if the (sub)module hardreset line is currently asserted,
90 * 0 if the (sub)module hardreset line is not currently asserted, or
91 * -EINVAL upon parameter error.
93 int omap4_prminst_is_hardreset_asserted(u8 shift, u8 part, s16 inst,
98 v = omap4_prminst_read_inst_reg(part, inst, rstctrl_offs);
106 * omap4_prminst_assert_hardreset - assert the HW reset line of a submodule
107 * @rstctrl_reg: RM_RSTCTRL register address for this module
108 * @shift: register bit shift corresponding to the reset line to assert
110 * Some IPs like dsp, ipu or iva contain processors that require an HW
111 * reset line to be asserted / deasserted in order to fully enable the
112 * IP. These modules may have multiple hard-reset lines that reset
113 * different 'submodules' inside the IP block. This function will
114 * place the submodule into reset. Returns 0 upon success or -EINVAL
115 * upon an argument error.
117 int omap4_prminst_assert_hardreset(u8 shift, u8 part, s16 inst,
120 u32 mask = 1 << shift;
122 omap4_prminst_rmw_inst_reg_bits(mask, mask, part, inst, rstctrl_offs);
128 * omap4_prminst_deassert_hardreset - deassert a submodule hardreset line and
130 * @rstctrl_reg: RM_RSTCTRL register address for this module
131 * @shift: register bit shift corresponding to the reset line to deassert
133 * Some IPs like dsp, ipu or iva contain processors that require an HW
134 * reset line to be asserted / deasserted in order to fully enable the
135 * IP. These modules may have multiple hard-reset lines that reset
136 * different 'submodules' inside the IP block. This function will
137 * take the submodule out of reset and wait until the PRCM indicates
138 * that the reset has completed before returning. Returns 0 upon success or
139 * -EINVAL upon an argument error, -EEXIST if the submodule was already out
140 * of reset, or -EBUSY if the submodule did not exit reset promptly.
142 int omap4_prminst_deassert_hardreset(u8 shift, u8 part, s16 inst,
146 u32 mask = 1 << shift;
147 u16 rstst_offs = rstctrl_offs + OMAP4_RST_CTRL_ST_OFFSET;
149 /* Check the current status to avoid de-asserting the line twice */
150 if (omap4_prminst_is_hardreset_asserted(shift, part, inst,
154 /* Clear the reset status by writing 1 to the status bit */
155 omap4_prminst_rmw_inst_reg_bits(0xffffffff, mask, part, inst,
157 /* de-assert the reset control line */
158 omap4_prminst_rmw_inst_reg_bits(mask, 0, part, inst, rstctrl_offs);
159 /* wait the status to be set */
160 omap_test_timeout(omap4_prminst_is_hardreset_asserted(shift, part, inst,
162 MAX_MODULE_HARDRESET_WAIT, c);
164 return (c == MAX_MODULE_HARDRESET_WAIT) ? -EBUSY : 0;
168 void omap4_prminst_global_warm_sw_reset(void)
173 if (cpu_is_omap44xx())
174 dev_inst = OMAP4430_PRM_DEVICE_INST;
175 else if (soc_is_omap54xx())
176 dev_inst = OMAP54XX_PRM_DEVICE_INST;
177 else if (soc_is_dra7xx())
178 dev_inst = DRA7XX_PRM_DEVICE_INST;
182 v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION, dev_inst,
183 OMAP4_PRM_RSTCTRL_OFFSET);
184 v |= OMAP4430_RST_GLOBAL_WARM_SW_MASK;
185 omap4_prminst_write_inst_reg(v, OMAP4430_PRM_PARTITION,
186 OMAP4430_PRM_DEVICE_INST,
187 OMAP4_PRM_RSTCTRL_OFFSET);
190 v = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
191 OMAP4430_PRM_DEVICE_INST,
192 OMAP4_PRM_RSTCTRL_OFFSET);